<template>
  <div class="json-editor">
    <label>
      <textarea ref="textarea" />
    </label>
  </div>
</template>

<script>
import CodeMirror from 'codemirror'
import 'codemirror/addon/lint/lint.css'
import 'codemirror/lib/codemirror.css'
import 'codemirror/theme/rubyblue.css'
import 'codemirror/mode/javascript/javascript'
import 'codemirror/addon/lint/lint'
import 'codemirror/addon/lint/json-lint'

require('script-loader!jsonlint')

export default {
  name: 'JsonEditor',
  props: {
    value: {
      type: [Array, Object],
      default: () => {
        return null
      },
    },
  },
  data() {
    return {
      jsonEditor: false,
    }
  },
  watch: {
    value(value) {
      const editorValue = this.jsonEditor.getValue()

      if (editorValue) {
        this.$emit('change', editorValue)
      } else {
        this.$baseMessage('JSON不能为空,否则无法生成表格', 'error')
      }
      if (value !== editorValue) {
        this.jsonEditor.setValue(JSON.stringify(this.value, null, 2))
      }
    },
  },
  mounted() {
    this.jsonEditor = CodeMirror.fromTextArea(this.$refs.textarea, {
      lineNumbers: true,
      mode: 'application/json',
      gutters: ['CodeMirror-lint-markers'],
      theme: 'rubyblue',
      lint: true,
    })

    this.jsonEditor.setValue(JSON.stringify(this.value, null, 2))
    this.jsonEditor.on('change', (cm) => {
      if (this.isJsonString(cm.getValue())) {
        this.$emit('change', cm.getValue())
      }
    })
  },
  methods: {
    getValue() {
      return this.jsonEditor.getValue()
    },
    isJsonString(str) {
      try {
        if (typeof JSON.parse(str) == 'object') {
          return true
        }
      } catch (e) {}
      return false
    },
  },
}
</script>

<style scoped>
.json-editor {
  position: relative;
  height: 100%;
}

.json-editor >>> .CodeMirror {
  height: auto;
  min-height: calc(100vh - 220px);
}

.json-editor >>> .CodeMirror-scroll {
  min-height: calc(100vh - 220px);
}

.json-editor >>> .cm-s-rubyblue span.cm-string {
  color: #f08047;
}

.json-editor >>> .cm-s-rubyblue .CodeMirror-gutters {
  padding-right: 10px;

  /* background: transparent; */
  border-right: 1px solid #fff;
}

.json-editor >>> .cm-s-rubyblue.CodeMirror {
  /* background: #08233e; */
  color: white;
}
</style>
